Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c5507c5e9eb1800f82eba62f4b45f7e737588a82e2c33a7e064a505168bd2c' 
  AND token = 'oJ+Woss6CzuXwBCPb2ls3crEi7gnnuHbjsR8Nyj5uYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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