Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd4bf785a63b968ca28a1a1188738d7acbd1096ad892b6ad5c03da6b0ddb75b1' 
  AND token = '8Ms4s7QuayZQ/R/HQd5qkWm7VLIv28CEXmyGMNYDE8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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