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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b0e8370918fcc602c7c86e7f53979972834556c0586edbcc8076e00084c4b65' 
  AND token = 'ws96nMcA3VMM/Eul99Tc5DM/AIdtvsgdoF6I/qnP9Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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