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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e88d0cd13b8bd08815baf87ac9a2632166cf3087dcfcbc541b22cc2a904d52' 
  AND token = 'xuTj9kvo2T9CUgQo8hOT1XHslf6tp8e60Meh6jqDOVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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