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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03e3e158c9de2ce45e1d138400e1f1de599128ff16506ec272600f110566bf01' 
  AND token = '6l01pZR17EjWe5rWC7Do+uffXTCllnE0BO7UNg3QTcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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