SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9627293f25c411f3d5c2afba957935985416ab0eb3f9d8c68e772016c4e476bd' 
  AND token = 'eE4W4+lGJR7LkF/Ybxh6opGjal7q0jYMgenW8oYC5TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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