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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6197cc3deeb5ee944afdadeb9e9785feee73d4b94d1427df9e78c673dcdc9ea2' 
  AND token = 'jNKCa0oPdIWO/ck1LCcs33cS6DVHv3dp8jGPs/zngBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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