SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12280f3c6e66484a838dd5d41fd60f35c940729805cb53fc8c288a7782d06499' 
  AND token = 'K6bpg93JzL9JQks5GdMhYQ/rihvIvLksNmy2J4IgW9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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