SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6235ca0068d847b0f800d972f86c1c19ba5441e7b20868a07b44d03629678eea' 
  AND token = '68Unl9F3F5JF82kUVsLlttfEK7QPYBj1v0INcq+hFUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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