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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e6d7f127de6666e517b88a4ab36f28fde4da19ef02fc8c620757cb7970c3429' 
  AND token = 'aU8xObuzmriEIFSCyKWK7HpHrPkIaq/thdCvaUUu/Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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