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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '958f28b571fea0ea531ca4a7cc06aa5a101ead6e7596e003cb56e2f1b02556cd' 
  AND token = 'ULmqqlq+yyIEkKJ8kAtATI1HFrE2jABNsUALmM537/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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