SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfc8dd6d7e0fa6b4d1112d5949598c8097ef4491c3cff858c80599e845671dcb' 
  AND token = 'LBoGtOymdwD4q13qZphlKypCZR/BZGm6kObWX/jVBY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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