SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d8d3677ac4ef911295d6aabce3b5af921d0b1073b0fd3dc4d47034848f888af' 
  AND token = 'sD1fNxJlHtj8PuzqZ5MEp5c8f1ngFRMXj/4QeRZuNQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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