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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17731416c8f03eacf23fafc73cd77a385013887647269c613762e66266d12f24' 
  AND token = 'bEp9Esm9rGHXxBPOql9UySkI7FwRMFlEXdtHWtDRqiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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