Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c8913040b91fdb354696c3d7d5a2da424e2d2749e59ff3a08a9cd396df736cb' 
  AND token = '12RF1ntjK4JFkwTCJa5CT3EeXJZ8bn9fi/X0diIdzj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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