SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2344fc3668c5934aa833c4babacc6164da94e990fb25f7a6ffe16163b45eb693' 
  AND token = 'qXHm4/qaYXjNt4S4zQAPug0spZW+K1zDvbj9GMDQMfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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