Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2dcfed5cdf8f2ff5a7f13e7da6ed54f4d515514f76a4420f8d8df7fb3c7a070' 
  AND token = 'OAiFqr2wlj8SdQc0DPetuse0hhYwbT3GEnfe8dIapB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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