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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abf63c42c808d9607f163c0023b0e038b213e3c0ca2f65db42e835b1b18b680b' 
  AND token = 'RpwR76s2TRCKeXrDlPalKsp9MjJ+05cvCB4QVrx7b/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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