SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '676408064d3150317dad3f23a85b434f705e14016e226ba81f063d99a6040ae3' 
  AND token = 'zQwGdWTQ0wgBTfxUiuOKxEJxhbjzR3kszB9ecMpZLHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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