SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05799223faa24ab6f18c57be28c513b3827314e9f1d5531a2c3726f95346be19' 
  AND token = '/ZsWCQgPGsl8oB9LMhhC4ZXPtvRn6RMsgYz2mvB/rPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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