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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2727c8dfc4e83bc3fca4b2d2c639d208683486fc0b9369a8f01663653e75d31' 
  AND token = 'EUWrKyRhsrExOOMqq0DJbOrAzUL1vv7Ecu+rX7ou1Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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