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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b3dce68885c141a52f1951a67006f2075b6101f9cd6c35b5d740a8018f4a16c' 
  AND token = 'WiJSF7W9009Qh/XiIUuNolodjRi90AcqApa9cwXiXCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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