Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3ce3d5c9ec1b7ddc72fea526af7dbeea4120a5abd77c8901caa10c74c244551' 
  AND token = 'X+/NQ5wQW/PGAkEMtRV83JXQf5xSjCwlbZ+MNb93z34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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