SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b3817f0a5495b97159baaab68fc9f3761c95c992847e07051743fb714bd2ae2' 
  AND token = 'z/xcu0m/9bgZ8w4eqQlcQeLWYwpgwzBUek0NRDhRd8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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