SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01d4344b2c5797f3981f51e5cc742ac4a547c669e52c322a2ce3f436e52cd200' 
  AND token = '0eKxnZ9rwr0HG9jWgPni3//9SfWuFXhcxYVMMfmjcBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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