Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15b3be8ceb2ccfac744e71bfc05c9f59dbb7c73e375249bb7b5251365fde9c98' 
  AND token = 'im6WloOwigH5sQdEMjTRBN6mS83wpeiOOqzjoVnQGfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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