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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1a26a3e65bc317ebf71baf884dc16d4ac20df930fee7b69349376179e616178' 
  AND token = 'OxO3Kz7WAOU2ynmcwwiHAw8FLRuvf3K8JUiSdL4xqbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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