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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58f4cf8945e494f42bb607e939db3b8a286f8c13ca56536f2ee7766bf9ba9b93' 
  AND token = 'gCPEFLMzoeW4jY3cz5yom2iqczAs7qnVvy82+lfnoN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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