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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54c2d732b11d58651da9275a8ce6d7dcacf2017da5c8fc49f972b07ecdf7d054' 
  AND token = 'xQcrG8G+gYXP5ryvOkeMzWZxme2SpaWFn1rEDPB/O1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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