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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd18cf199eb0a44d8f5987b1df1285f11db73dd7d0a0e610e639591117ab06cfd' 
  AND token = 'j0Ou8Q76mqzYdHYpO2kx6Fc7qgYh+i849SI3HHwszAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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