SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8103e3d6a8f4f5602ac623720739744d536b5ee5e0d15adf3c2696a6fde122d5' 
  AND token = 'ASE0qG0+LA32YVzAgEVlSm8qv2j7l113YmdZgOx/USY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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