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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48e252ec8480dd01e5a83c73f4405ebbe886c349c20648ef0c462818f9c92a38' 
  AND token = 'C6SC2H3jqL022V7LM9Xs9xwwC9tuHaWBiWqMJ2CjEBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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