SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56f1130a1e2677e639d6b89b75fdb8a881cba327b90040ac6c7caf13a6b3f8cc' 
  AND token = 'EOepz3PXjb3LAihRWrVvlzvKRqjoZaZqdGS8JYjZS3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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