SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b02eac91cee371c68592a35732c2d32cb0fbdde302852bdb8d6db3e9072dac58' 
  AND token = 'hTG11VqFowOzzAgmQrVgG4W/wgg+9MqWUrkc8KhSMvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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