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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bee7ace9442f83348e00e11d5fbc44f0d7c214fc747b6c664be57e807710b5fa' 
  AND token = 'gjfnVK56OwGfUinGHu/yqMfxa+ydmqp7970Xi8a8o/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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