SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3986faa5c8e9d17d0682ba7ad31400844b4aa97c6d4d250803212ccc8d651f4f' 
  AND token = '7hS5jQ9fmVm0jKBBrvIunoGoFhuiN/ptL9mHCaNo9Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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