SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce68ee1fec95ada1dc2086405329366fb99c7b7d4573c511847c4125b9f02130' 
  AND token = 'MJjaiC6tDvhzJoKXgEA5Amv1ZfqwxdqcxAmBo4V4ok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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