Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30af8f3091de269b7a2d35a92d8e7f6290f0a427eaf6ba1a2afe1b318d277bd3' 
  AND token = 'd8VGUkxOyQc9McP22F6Edgz1CZw+g5RhQ+2qXPt2nds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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