SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4126cff9fc26043ed2e26c48fcb9c19f07fb4776c98eacd9822761796c602b93' 
  AND token = 'OQGX9UcwZswKK1l1dG1wjEiTzJu3vI+/gSkLxN7ryuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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