SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '232d82ae88e95016365016ff8e20c6e58b4503e08716f0ceec9b68a974fdea16' 
  AND token = 'AWRLul+sduI8V0pxl63FoUJgxJWmjFBZs1KacygBFwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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