SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfb739e1ec47f1b1d813215730fa6d618e2eb79a4dbbaa8265cc873741078d99' 
  AND token = 'wnBLzv6dKvjjHxT/6AdNICrqWCaNWQ3SeCdyGXku4/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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