Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '474b4a83bb82cf13287cfe66d57dfe949d0bcdfc9aa8fd87628dd09ed84d3fd6' 
  AND token = 'jRq3gBZpuDootAXaQn5IMIgRkrSRC+j8eySHCuJtvSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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