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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38ea4e94c900d96859b45ceab73acfeac9193359b326e649dbca3b03d032bb24' 
  AND token = 'uvovR8phmf8V/RLMSd4eBw9obTIMk84yt7iPlY2iRjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}