SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3dc22b2ada14bdbd291f0e10b9d68799448aec6c9a3b9152b8df3d4abe0f107' 
  AND token = 'X7KzJqlZ5a87R+MvSY9ouC93gdQ0IBWjggaptQCxKIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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