SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd56b24fb25abdb197c8be4f1978e6eb88e3d770a38cceb31df6524df03e683e0' 
  AND token = 'mm1Tgi7ZjFvJiIQYDg/lALVpqi9IZUtYkR0S8f1pCdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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