Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5a4ad30471d2ae124d64026d5b98a8a52bf2bbc0879a9250e1fe223a20f4c6c' 
  AND token = 'l2tQRP0wL2FnW3zlirsLsgWV1knf9lPRo4itzQfzh1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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