SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6468f982a88305c7ec4c68cc332b4027cd66b2f350e8707f50ed175cb05907a' 
  AND token = 'd4Tw1wPqwzKAGeazMQhg6XfDmHFvFKLGxwI4M1fXsLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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