SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bfa1af1dde0062acb524d5d518d21917c4a3b989e9f3fc041f3fafcc50425b7' 
  AND token = 'BWIvqn9vOCoTomhB+yOZK6Z2avFnVu9jH4zGKZrh0cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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