SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45832b2f284d0f798aab934753bd2aebdf06d114581019038949b688edc6607f' 
  AND token = 'dFpYnwBmSSpgVPg+K+T2Aj0jKmtueCHYtbU0KfrLFms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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