SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd36ba8721ba5b86f2cb301f3f74fc2aae980fb37f974a66274c22f9bbadd15cf' 
  AND token = 'UjXJo03rFMD1PkaWNjDLAuORVZroe998Skg+vXPC+Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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