SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69279f22918ae0c4f731411de38fcf12a0a4d519ae45d83d164ab7d0216b2aab' 
  AND token = '8uR3fY9Fr3OZHjzuXmGqb3DVnwFaPGLQLr3oWC50X50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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