SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '725c9cf37b485e861f3964485a3369b1cdc8e3efa4bb42b25b90b7487eb51dfd' 
  AND token = '3GVVL97+5UwdbQSxAnniXxwXjEMOvRs4KGgYJNX2E2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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