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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aaa2001d7a9707679e6a111b3ab7052d8b2a6aa1cb890694dd2f8ad50a36dee' 
  AND token = 'mm9+GoblcCDK+0alpmQb2dOV392rRmM7Fl5c9uqohko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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