SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa68d18bf1d311c0d76fe9704dd5e9d2fc9e159f2a12aa53406a28081d2b825e' 
  AND token = '3mH9OXK0U/gJBdz5/I86Kxke+v/H64wLP+1NG4Dir2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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