SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '882ca084d1bfc1ae976dd36b97fec24919363eaddcab2f1f64c5d14a2ad6216e' 
  AND token = 'XEIbkPhK2I/vtWBdxtB0DRQVq4hV+g+LqVY2gJTzfCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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