Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd977f164731f9a23ddd0b9c7cabc56ffcda474f5922ba2f2c0a374e03fe7ab70' 
  AND token = 'ZUmt0Ol2JWHub7uTFPqDsIhVxdKdFtx82Cr8+mtDtc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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