Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b00f8ee9a75d3bfcc0edf52364cdf1ee7c4f3b47e83915501a81454c9462fb6' 
  AND token = '4rFHAnSahJNQLWXMu+IxEFeeEB/dVVxS+OfwKQuP7AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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